[ncl-talk] Problem using gsn_add_polyline twice

[Anne]

Yes that solved the issue - thanks Rick!

cheers
Anne

On Thu, Jan 30, 2020 at 3:14 PM Rick Brownrigg <brownrig at ucar.edu> wrote:

> Yea, looking at your plots, I agree with your assessment. The docs for
> gsn_csm_xy2 state this about the return value (which you're assigning to
> "plot"):
>
>     http://ncl.ucar.edu/Document/Graphics/Interfaces/gsn_csm_xy2.shtml
> Return value
>
> The return value is the scalar id of the first XY plot created.
>
> The scalar id of the second XY plot is returned as an attribute called
> "xy2". This attribute or the return value can be used in calls to functions
> like *gsn_add_polymarker*
> <http://ncl.ucar.edu/Document/Graphics/Interfaces/gsn_add_polymarker.shtml>
> or *gsn_add_polyline*
> <http://ncl.ucar.edu/Document/Graphics/Interfaces/gsn_add_polyline.shtml>
> to add primitives to either plot.
>
> The id of the data object is returned as an attribute called *data*. This
> is useful if you want to use setvalues
> <http://ncl.ucar.edu/Document/Manuals/Ref_Manual/NclStatements.shtml#Setvalues>
> to change some data options after this function has been called.
>
> - - - - - - - -
>
> Perhaps  try passing in "plot at xy2" rather than just "plot" in the second
> call to gsn_add_polyline()
>
> HTH,
>
> Rick
>
>
>
>
>
> On Thu, Jan 30, 2020 at 6:14 AM Anne via ncl-talk <ncl-talk at ucar.edu>
> wrote:
>
>> Hi NCL users,
>>
>> I have a xy-plot consisting of 2 y-axes, and I am using gsn_csm_xy2 for
>> this purpose, each axis having a set of lines. For both sets of y lines, I
>> want to overlay the mean of those lines by using gsn_add_polyline. This
>> works fine for the one set of lines, but the mean for the 2nd data set is
>> false because it is oriented on the left axis instead of the right axis as
>> it should be (see plots attached). How can I overcome this issue?
>> I have attached the script and the pots.
>> When I plot only 1 set of lines, so using 1 y-axis, then the overlying
>> works fine.
>> My guess is that NCL gets confused using gsn_add_polyline twice, and it
>> aligns both additional lines at the left axis.
>>
>> Anyone has any experience with this?
>>
>> Thank you
>> Anne
>>
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